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        /* div{width: 800px;height: 300px;border-style:dotted;border-color: red;border-width: 31px;} */
        div{width: 800px;height: 300px;border-right-style: dotted; border-right-color: lightcoral;border-right-width: 10px;}
    /* 单独对某一条边框进行设计 */
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